What is the air quality trend in Elgin?

Over the past 14 days, Elgin had an average AQI of 30 based on station measurements. The worst day was 2026-10-20 with AQI 53.

How is Elgin air quality measured?

Air quality in Elgin is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Elgin, United States

Name: Elgin Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Elgin, United States.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 136 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-20	53	22–73	14.0 µg/m³	24h	121
2026-10-19	28	22–41	6.7 µg/m³	24h	138
2026-10-18	23	17–38	5.6 µg/m³	24h	127
2026-10-17	16	13–24	3.9 µg/m³	24h	138
2026-10-16	19	10–36	4.5 µg/m³	24h	132
2026-10-15	24	14–41	5.8 µg/m³	24h	138
2026-10-14	39	19–54	9.4 µg/m³	24h	138
2026-10-13	34	25–49	8.2 µg/m³	24h	138
2026-10-12	43	32–56	10.4 µg/m³	24h	139
2026-10-11	32	29–35	7.6 µg/m³	24h	139
2026-10-10	31	25–42	7.4 µg/m³	24h	120
2026-10-09	35	25–45	8.3 µg/m³	24h	124
2026-10-08	25	20–35	6.0 µg/m³	24h	134
2026-10-07	26	21–30	6.3 µg/m³	21h	128

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